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JOSEPH H. DAVIS, OF ALLEGHENY CITY,` PENNSYLVANIA.

Letters Patent'No. 99,653, dated February 8, 1870.

IMPROVEMENT IN 'VALvE-COCKS MADE OI'- .CAST-IRON AND SUBSEQ'UENTLY .ANNEALED The Schedule referred` to in these Letters 'Patent and making part of the same.

` new article of manufacture, viz: valve-cocks constrncted of cast-iron,.and subsequent-ly annealed.

To enable others skilled in the art to make and use 4 my invention, I will proceed to describe its construction.

In the accompanying drawings, which form part of my specification- Figure 1 is a vertical and longitudinal section ofthe valve-cock, for which Letters Patent were granted to me, December 29, 1868, and which I now propose making of cast-iron, and'subsequently annealed.

Figure 2 is a side elevation of the same.

Thebody of the valve-cock, consisting of the chambers'A B and B', is made in one piece, and is cast in the usual way. The bore of the chambers A B and B', are all of the same diameter.

The inlet g, and outlet, h, are of such diameter that they will receive pipes, the bore ofA which may be equal to 'the opening c for the valve D.

The cap or mounting fof the Valve-chamber A,n1ay be made of malleable iron, steel, or brass, and the valve D and its stein may also be made ofthe same metals.

The castings for the several parts of the valve should be made of that quality of pig-iron, which is suitable br being converted into malleable cast-iron,77 by any of the known methods, which malleable castings may afterwards be subjected to the process of celnentation, and thereby be convertedinto steel. The castings after being properly converted into malleable cast-iron, are then carefully cleaned by placing them in a rattling-mill or scouring-mill, such as are used by manufacturers of malleable castings. After being properly cleaned, they are titted up so as to finish and .complete the valve in all its parts, as

shown inthe accompanying drawings.

Now, if it is desirable to convert the entire valve, or any of its parts, intosteel, the different parts are sepV arated and placed in suitable cementing-chests, or chambers, and subjected to the process of cementaf tion, which process is well understood by the skilful metallurgist. l

The advantage of constructing valve-cocks of castiron, subsequently annealed, consists First, in inakinga stronger andmore durable'valvecock, than can be made of ordinary cast-iron or brass,

for the tensile strength of annealed cast-iron is greater than either cast-iron or brass.

Second, a valve-cock so constructed, may be made much lighter than when made of ordinary cast-iron or brass, thereby saving stock and cost of transportation.

Third, a valve-cock, constructed of castiron,`and subsequently annealed, as herenbefore described, can be made cheaper than when made of brass, and is equally susceptable of a fine finish, and at less cost for finishing.'

Fourth, valve-cocks of every kind, form, and size may, with advantage, be constructed of cast-iron, and subsequently annealed, as herein described.

Fifth, any one or more of the several parts of the valve-cock-may with ease, facility, and cheapness be made of steel, by constructing it or them iu the manner hereinbefore described.

The skilful mechanic and manufacturer of valvecocks will readily see and understand from the foregoing description of my invention, that my improvement will be of gre'at advantage to the consumer and user of valve-cocks.

Having thus described the nature and construction of my improvement,

What I claim as of my invention, is-

A new article of manufacture, Viz: a valve-cock con structed of cast-iron, andsubsequently annealed, substantiall y as herein described. v

'Vit-nes'ses: JOS. H. DAVIS.

A. GIJoHNsToN, J As. G. THOMPSON. 

